CN107362648B - Industrial air purification system - Google Patents
Industrial air purification system Download PDFInfo
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- CN107362648B CN107362648B CN201710796486.8A CN201710796486A CN107362648B CN 107362648 B CN107362648 B CN 107362648B CN 201710796486 A CN201710796486 A CN 201710796486A CN 107362648 B CN107362648 B CN 107362648B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention discloses an industrial air purification system. Aiming at the main materialization and granularity distribution characteristics of the unstructured discharged smoke dust generated in the industrial production process, the invention adopts a louver, a high-efficiency separation groove plate and an electrostatic integrated three-stage particle capturing method, and provides a spraying and liquid film flushing two-stage particle ash cleaning process, thereby finally realizing the high-efficiency capturing of the unstructured smoke dust in the industrial production process and thoroughly improving the operation environment; on the basis of 'shutter + high-efficient separation frid + electrostatic integration tertiary granule catches' and 'spray + liquid film washes two-stage granule deashing', further adopt 'filter concentration + filter-pressing granule raw materials recovery' to realize dust granule recycle and industrial water cyclic utilization.
Description
Technical Field
The invention belongs to the field of atmospheric pollutant treatment, in particular to the technical field of dust purification and dust removal generated in an unorganized emission place, and particularly relates to an industrial air purification system.
Background
The productive dust formed in the industrial production (industries such as metallurgy, exploitation, mechanical manufacture, refractory material processing, spinning, packaging and the like) can float in the air of a working place for a long time, is an important occupational disease hazard factor for polluting the working environment and damaging the health of workers, and can cause various occupational lung diseases including pneumoconiosis. During the period of thirteen five, the environmental protection department decides to revise pollutant emission standards and comprehensive emission standards of atmospheric pollutants in industries such as steel, building materials, colored, thermal power, boilers, coking and the like, and adds an 'unorganized emission control measure', so that dust emission in the production process is ensured to reach national environmental protection and safety and sanitation standards.
The inorganized emission mainly comprises the steps that atmospheric pollutants do not pass through an exhaust funnel, or the exhaust funnel is less than 15 m in irregular emission, and the inorganized emission pollution problem can be caused by stacking of materials, open conveying pipelines, volatile gas leakage and the like in working places widely existing in industrial fields such as steel, quarries, metallurgy, power plants, storage yards and the like. The existing unorganized emission treatment measures mainly comprise the following steps: (1) various particle agglomeration techniques promote natural sedimentation of particles, such as a dry mist dust suppression process of foam of superfine particle dust without tissue emission disclosed in CN201310732184.6, a water mist dust remover disclosed in CN201310128862.8 and a biological nano-film dust suppression desulfurization dust removal device disclosed in CN 201620392970.5; (2) the filtering technology is represented by a filtering component, a filtering device and a dust removing device disclosed in CN201610080302.3, an industrial waste gas filtering dust remover disclosed in CN201310671444.3 and an electric furnace smoke discharging dust removing device disclosed in CN 201410693729.1; (3) an electrostatic dust collection technology, such as a roof type electrostatic dust collection and exhaust device disclosed in CN201320497675.2, an industrial waste gas electrostatic dust collector disclosed in CN201310328223.6, and the like.
In the treatment measures of the unstructured emission, the industrial electrostatic precipitator is widely applied to various large-scale production processes, especially metallurgy and casting industries, due to the advantages of low pressure loss, high efficiency, low operation cost and the like. However, the electrostatic dust collection equipment generally adopts an interval mechanical vibration dust collection mode to ensure the safe operation of the equipment, for example, patent application CN201310328223.6 is an industrial waste gas electrostatic dust collector and a CN200420017200.X submerged arc furnace roof electric dust collection device. However, secondary back mixing of particles is easy to occur in the use of the electrostatic precipitator and during the ash removal by mechanical vibration, so that the discharge of particles at an outlet of the device exceeds the standard, or although a small number of the devices adopt wet ash removal, the intermittent operation of the devices and the discharge of flushing waste liquid exist in the ash removal process, and meanwhile, most of the devices adopt steel structural members, the devices are heavy and large in size, the occupied area is large, and the electrostatic dust removal efficiency needs to be further improved.
In addition, the dust generated in the production process of iron and steel and metallurgy industry, such as the dust generated in the processes of raw material storage and transportation, raw material crushing, material mixing, crushing and screening and the like in the pellet production, and the analysis results show that: the dust concentration dissipated into the atmosphere can reach tens of grams to hundreds of grams per cubic meter instantaneously, the particle size distribution is 1 to 1000 microns, the content of the iron concentrate powder is up to 90 percent, and the dust enters the atmosphere in an unstructured way to cause pollution, resource waste and cost loss, and if the dust can be recycled, the dust has great consumption reduction potential for reducing the cost of ton ores.
Disclosure of Invention
Aiming at the technical problems faced by the control of the unorganized emission, the invention provides a simple, feasible and easy-to-operate particle control measure and a dust recycling process aiming at the unorganized emission smoke components and composition characteristics of different industries in the industrial fields of steel, quarries, metallurgy, power plants, storage yards and the like, which has important significance in greatly reducing the unorganized emission, practically improving the production operation environment, effectively improving the energy utilization efficiency and promoting the improvement of the quality of ambient air.
One of the purposes of the invention is to provide an industrial air purification system aiming at the main materialization and granularity distribution characteristics of the unorganized emission smoke dust generated in the industrial production process. The invention adopts a shutter, a high-efficiency separation groove plate and an electrostatic integrated three-stage particle capturing method, and provides a spraying and liquid film flushing two-stage particle ash cleaning process, so that the high-efficiency capturing of the unstructured smoke dust in the industrial production process is finally realized, and the operation environment is thoroughly improved.
The invention aims at solving the problem of resource utilization of the unstructured discharged smoke dust generated in the industrial production process on the basis of prevention, control and dust removal, and provides an industrial air purification system, which further adopts 'filtering concentration and filter pressing particle raw material recovery' to realize resource utilization of dust particles and recycling of industrial water on the basis of 'shutter + efficient separation groove plate + electrostatic integrated three-stage particle capture' and 'spraying + liquid film flushing two-stage particle ash removal'.
A third object of the present invention is the use of the above-mentioned industrial air purification system.
Specifically, the invention discloses the following technical scheme:
the invention discloses an industrial air purification system, which comprises a multi-effect dust removal device and a flushing device, wherein the multi-effect dust removal device comprises a shutter dust removal section, a high-efficiency separation groove plate dust removal section and an electrostatic dust removal unit, and a waste liquid collection structure for collecting waste liquid is arranged at the bottom of the multi-effect dust removal device; the multi-effect dust removing device further comprises a fan, the fan is arranged at a gas inlet or a gas outlet of the multi-effect dust removing device, and dust-containing gas sequentially passes through a shutter dust removing section, a high-efficiency separation groove plate dust removing section and an electrostatic dust removing unit for dust removal; the flushing device comprises a spraying flushing device and a water film flushing device, the spraying flushing device flushes particles adhered to the shutter dust removing section and the high-efficiency separation tank plate dust removing section to a waste liquid collecting structure at the bottom of the high-efficiency dust removing device in a spraying mode, the water film flushing device adopts a mode of continuously soaking the anode plate of the electrostatic dust removing unit by liquid drops, and a uniform flushing water film is formed to flush the particles captured to the anode plate to the waste liquid collecting structure.
The high-efficiency separation groove plate dust removal section is formed by staggered arrangement of a plurality of rows of channel steel with the same specification, the channel steel openings are in the same direction, the channel steel is arranged at equal intervals, the distance between two adjacent channel steel in the same row is smaller than or equal to the waist height of the channel steel, and the distance between the upper channel steel and the lower channel steel is smaller than or equal to the leg width of the channel steel.
Preferably, the electrostatic precipitator unit further comprises a step-up voltage generator, such as a high voltage power supply.
Preferably, the spray flushing device consists of a water pump, a valve, a spray pipe and a nozzle, wherein the spray pipe comprises a main pipe and a plurality of branch pipes, and the nozzle is arranged on each branch pipe.
Preferably, the water film flushing device comprises a water film flushing main pipe and an anode water distribution pipe, wherein the water film flushing main pipe is communicated with a plurality of anode water distribution pipes, water outlets are formed in the bottoms of the anode water distribution pipes, water discharged from the water outlets infiltrates the anode plate of the electrostatic dust collection unit, and uniform flushing water films are formed to flush particles captured to the anode plate.
Preferably, the waste collection structure is a waste tank. In addition, the waste liquid collecting structure is also provided with an electric heating device for preventing and controlling the waste liquid from freezing in winter.
The fan is preferably a diagonal flow fan. Preferably, the diagonal flow fan is arranged at the gas outlet position of the multi-effect dust removing device.
Preferably, the louver dust removing section, the high-efficiency separation groove plate dust removing section and the electrostatic dust removing unit in the multi-effect dust removing device are arranged from bottom to top, gas flows from bottom to top in the multi-effect dust removing device, and the dust removing effect is better.
Secondly, the industrial air purification system disclosed by the invention further comprises a waste liquid concentration device, a filter pressing device and a clear liquid circulation pipeline, wherein the waste liquid collection structure is used for concentrating through the waste liquid concentration device, then the waste liquid is treated through the filter pressing device, the filter cake is recycled, and clear liquid generated by the waste liquid concentration device and the filter pressing device is returned to the flushing device through the clear liquid circulation pipeline for recycling.
Preferably, aiming at the characteristics of dust waste liquid, the invention adopts a multi-pipe filter for concentrating the waste liquid, wherein the multi-pipe filter consists of a waste liquid pump, a filter, a concentrated liquid discharge pipe and a back flushing pump.
Preferably, the filter pressing device is a plate-and-frame filter press, and the separated filter cakes enter a raw material bin for recycling.
Preferably, the industrial air purification system disclosed by the invention further comprises a centralized control system, wherein the water film flushing device, the spray flushing device, the electric heating device, the waste liquid concentration device, the filter pressing device and the fan can be automatically started and stopped through the centralized control system according to preset conditions.
In addition, the invention also discloses application of the industrial air purification system in dust removal and dust recycling.
Based on the application, the invention discloses a control process for the smoke dust discharged in an unorganized way, which adopts the industrial air purification system and is characterized in that:
the smoke dust discharged in an unorganized way enters an inlet of the multi-effect dust removing device along with the environmental air flow under the suction or blowing action of the fan;
intercepting particles with the particle size of more than 50 microns at an inlet of equipment in a shutter dust removing section to realize primary dust removal;
the dust-containing air flow after passing through the shutter dust removing section flows through the high-efficiency separation groove plate dust removing section, and particles with the particle size of more than 10 microns are intercepted before an electrostatic field of the electrostatic dust removing unit for secondary dust removal;
the residual fine particles enter an electrostatic field of the electrostatic dust removal unit, and under the action of a high-voltage power supply, the fine particles move to the surface of an anode to be efficiently captured under the action of an electric field force after being charged, so that three-stage dust removal is realized, and the treated air flow meets the clean discharge requirement to be discharged;
dust particles captured by the shutter dust removing section and the high-efficiency separation groove plate dust removing section are washed into a waste liquid collecting structure by washing water sprayed by a spraying washing device; dust particles on the anode of the electrostatic dust removal unit are washed into the waste liquid collecting structure by the water film washing device, so that waste liquid collection is realized.
Preferably, the control process of the unorganized emission smoke further comprises: the waste liquid collected in the waste liquid collecting structure is initially concentrated through the waste liquid concentrating device, the concentration of the concentrated liquid is about 10-20%, clear liquid after concentration treatment is connected to the inlet of the water film flushing device for recycling, the concentrated liquid enters the filter pressing device, the separated filter cakes enter the raw material bin for recycling, and clear liquid separated by the filter pressing device is connected to the inlet of the water film flushing device for recycling.
The invention has the following beneficial effects:
(1) After the smoke dust discharged in an unstructured way is treated by the industrial air purification system, the device outlet has no exceeding discharge, secondary dust emission is avoided, and the gas meets the requirements of clean discharge of the smoke. According to the invention, a shutter, an efficient separation groove plate and an electrostatic integrated three-stage particle capturing method are adopted, particles with the particle size of more than 50 microns are intercepted in an equipment inlet by using the shutter, particles with the particle size of more than 10 microns are intercepted before an electrostatic field by using the efficient separation groove plate, residual finer particles enter the electrostatic field to be efficiently captured, and through a reasonably arranged step-by-step dust falling mode, no out-of-standard emission is caused at an equipment outlet, and through a spray and liquid film flushing two-stage particle ash cleaning process, dust is further suppressed, and dust overflow at an equipment outlet and out-of-standard emission possibly generated are reduced.
(2) The invention aims at the characteristics of unorganized emission of smoke dust to design and remove dust, and has high dust removal efficiency. The invention sets up the dust removal process of the step-by-step dust falling mode and effective, the initial dust-containing air flow (concentration several tens of grams to several hundred grams per cubic meter) enters the high-efficient separation tank plate dust removal section after the shutter dust removal section processes the air flow (concentration several hundred milligrams to several hundred grams per cubic meter), more than 10 microns of particulate matters are intercepted, at this moment the air flow (concentration several tens of milligrams to several hundred milligrams per cubic meter) is more favorable for the effective electrostatic adsorption dust removal of the electrostatic dust removal unit (not only avoid the excessive dust accumulation of the anode plate, but also reduce the wind speed, relatively lengthen the residence time of the dust in the electrostatic field, and reduce the influence of dust concentration, granularity to corona characteristics, promote the dust collection efficiency of the anode plate).
(3) The three-stage dust removing process and the two-stage dust removing process are simple and efficient in equipment, high in integration degree, light in weight and capable of being arranged at the top, the side wall and the outside or inside of a production place, and the problems of heavy weight and huge volume of the existing dust removing equipment are avoided; on the basis of improving the total capture efficiency of the particles, the working load of the subsequent electrostatic field is further reduced, and the industrial energy consumption is reduced.
(4) The invention not only effectively realizes the control of the smoke dust discharged in an unstructured way, but also realizes the recycling of dust particles (especially dust generated in the processes of raw material storage and transportation, raw material crushing, material mixing, crushing and screening and the like in the production of the pellets) by combining the characteristics of the dust removal and ash removal process and the filter pressing particle raw material recovery process, thereby further realizing the recycling of part of water treatment, fitting the actual industrial production and having wide market application prospect.
Drawings
FIG. 1 example 1 schematic diagram of an industrial air purification system
FIG. 2 example 2 schematic diagram of an industrial air purification system
FIG. 3 is a schematic view of the section and flow field of the dedusting section of the efficient separation channel plate
In the figure, a diagonal flow fan is adopted as 1, an electrostatic dust removal unit is adopted as 2, a high-voltage power supply is adopted as 3, a high-efficiency separation groove plate dust removal section is adopted as 4, a shutter dust removal section is adopted as 5, a waste liquid tank is adopted as 6, an electric heating device is adopted as 7, a waste liquid pump is adopted as 8, a water film flushing device is adopted as 9, a spray flushing device is adopted as 10, a water pump is adopted as 11, a multi-pipe filter is adopted as 12, a slurry pump is adopted as 13, and a filter press is adopted as 14.
Detailed Description
The present invention will be described in further detail below by way of examples, but the embodiments of the present invention are not limited thereto. Various modifications and alterations of this invention will become apparent to those skilled in the art, and it is intended to cover all such modifications, equivalents, and alternatives falling within the spirit and principles of this invention.
As described in the background art of the invention, for the technical problems faced by the control of the unorganized emission, the invention provides a simple, feasible and easy-to-operate particle control measure and a dust recycling process aiming at the unorganized emission smoke components and composition characteristics of different industries in the industrial fields of steel, quarries, metallurgy, power plants, storage yards and the like.
The invention discloses an industrial air purification system, which comprises a multi-effect dust removal device and a flushing device, wherein the multi-effect dust removal device comprises a shutter dust removal section, a high-efficiency separation groove plate dust removal section and an electrostatic dust removal unit, and a waste liquid collection structure for collecting waste liquid is arranged at the bottom of the multi-effect dust removal device; the multi-effect dust removing device further comprises a fan, the fan is arranged at a gas inlet or a gas outlet of the multi-effect dust removing device, and dust-containing gas sequentially passes through a shutter dust removing section, a high-efficiency separation groove plate dust removing section and an electrostatic dust removing unit for dust removal; the flushing device comprises a spraying flushing device and a water film flushing device, the spraying flushing device flushes particles adhered to the shutter dust removing section and the high-efficiency separation tank plate dust removing section to a waste liquid collecting structure at the bottom of the high-efficiency dust removing device in a spraying mode, the water film flushing device adopts a mode of continuously soaking the anode plate of the electrostatic dust removing unit by liquid drops, and a uniform flushing water film is formed to flush the particles captured to the anode plate to the waste liquid collecting structure.
The shutter dust removing section is a shutter inertial dust remover, and the airflow direction is changed sharply by impacting dust-containing airflow on a shutter baffle plate, so that the dust-containing airflow is separated from the airflow by the action of the inertia force of dust particles. The shutter dust removing section can intercept particles with the particle size of more than 50 microns, and the preliminary treatment ensures that dust-containing air flow with the concentration of tens of grams to hundreds of grams per cubic meter is purified to dust-containing air flow with the concentration of hundreds of milligrams to hundreds of grams per cubic meter, so that the pressure loss in the treatment process is small.
The high-efficiency separation groove plate dust removal section is formed by staggered arrangement of multiple rows of channel steel with the same specification, the opening direction of the channel steel is consistent, the distance between two adjacent channel steel in the same row is smaller than or equal to the waist height of the channel steel, the distance between the upper layer channel steel and the lower layer channel steel is smaller than or equal to the leg width of the channel steel, so that gas can meet the channel steel in the staggered arrangement of the other row when passing through the gap between the two adjacent channel steel in the same row, and air flow steering is generated, dust particles are separated under the action of inertia force and centrifugal force, and the section and flow field schematic diagram of the high-efficiency separation groove plate dust removal section are shown in figure 3.
The invention relates to a novel efficient separation groove plate dust removal section, which is an efficient inertial dust remover, has a unique groove structure, so that the air flow has stronger directivity, has good dust removal effect on metal or mineral dust (more than 10-20 mu m) with slightly larger purification density and particle size compared with the conventional reverse inertial dust remover, and particularly has the particle dust purification efficiency of more than 90% in the range of 10-50 mu m on the basis that the shutter dust removal section is subjected to primary dust removal. The pressure loss of the high-efficiency separation groove plate dedusting section is 100-300 Pa, and the wind speed of dust gas is reduced, so that the residence time of dust in an electrostatic field is relatively prolonged after the follow-up electrostatic field dedusting, and the electrostatic dedusting efficiency is improved.
The working principle of the electrostatic dust removal unit is that the high-voltage electric field is utilized to ionize the flue gas, dust charge in the air flow is separated from the air flow under the action of the electric field, the cathode is usually made of metal wires with different cross-sectional shapes, and the anode is made of metal plates with different geometric shapes (anode plates are also called dust collecting plates). The electrostatic precipitator unit further comprises a high voltage generator, such as a high voltage power supply.
The invention aims at optimizing and improving dust capturing efficiency, combines the characteristic of unorganized dust emission, and comprehensively optimizes, combines and improves the properties (pressure drop), dust characteristics (concentration and granularity of dust) of dust-containing gas, and industrial energy consumption, and finally adopts a louver + high-efficiency separation tank plate + electrostatic integrated three-stage particle capturing method to realize all high-efficiency capturing of dust particles.
In addition, the invention adopts effective measures, not only realizes the removal of captured particles (deposited dust), but also realizes the dust suppression effect in the treatment process through the spray, liquid film flushing and waste liquid collecting process (especially the spray and the timely collection of waste liquid). .
In the preferred embodiment of the invention, the spray flushing device consists of a water pump, a valve, a spray pipe and nozzles, wherein the spray pipe comprises a main pipe and a plurality of branch pipes, and the nozzles are arranged on the branch pipes. The particles adhered to the shutter dust removing section and the high-efficiency separation groove plate dust removing section are washed down by a spraying mode. The water pump is pressurized to spray through the high-pressure atomizing nozzle, so that dust particles in the shutter dust removing section and the high-efficiency separation groove plate dust removing section are effectively flushed down, and the dust washing efficiency is improved. The spraying and flushing device has the other function of flameout and cooling the high-temperature smoke dust so as to prevent subsequent equipment from being damaged and facilitate industrial safe production.
In a preferred embodiment of the invention, the water film flushing device comprises a water film flushing main pipe and anode water distribution pipes, wherein the water film flushing main pipe is communicated with a plurality of anode water distribution pipes, water outlets are arranged at the bottoms of the anode water distribution pipes, water discharged from the water outlets infiltrates an anode plate of the electrostatic dust removal unit, and uniform flushing water films are formed to flush particles captured in the anode plate.
The waste liquid collecting structure is preferably a waste liquid tank in view of light weight. In addition, the waste liquid collecting structure is also provided with an electric heating device for preventing and controlling the waste liquid from freezing in winter.
In a preferred embodiment, the fan is a diagonal flow fan. The inclined flow fan mainly comprises an impeller, a shell, an inlet current collector, an outlet flow deflector and a motor component, so that gas can do centrifugal motion and axial motion, and the motion of air in the shell mixes two motion modes of axial flow and centrifugal motion. Preferably, the diagonal flow fan is arranged at the gas outlet position of the multi-effect dust removing device.
In the preferred embodiment, considering that the invention adopts two-stage inertial dust removal, the shutter dust removal section, the high-efficiency separation groove plate dust removal section and the electrostatic dust removal unit in the multi-effect dust removal device are arranged from bottom to top, gas can flow from bottom to top in the multi-effect dust removal device, and the dust particle separation efficiency is further improved by virtue of multiple functions of inertial force, centrifugal force and gravity.
The invention also discloses an industrial air purification system for recycling dust particles, which comprises a waste liquid concentration device, a filter pressing device and a clear liquid circulation pipeline, and besides the multi-effect dust removal device and the flushing device, wherein the waste liquid collection structure is concentrated through the waste liquid concentration device and then treated by the filter pressing device, the filter cake is recycled, and clear liquid generated by the waste liquid concentration device and the filter pressing device is returned to the flushing device for recycling through the clear liquid circulation pipeline.
In the embodiment of the invention, the two-stage particle ash removal mode of spraying and liquid film flushing adopts a waste liquid collection mode and subsequent filtration concentration and filter pressing particle raw material recovery, so that not only is effective ash removal realized, but also the problem of dust raising again generated during the conventional drying ash collection treatment is avoided, a good dust suppression effect is obtained by adopting a waste liquid mode for collection, and the effective configuration of functions is realized by further effectively connecting the filtration concentration and the filter pressing particle raw material resource recovery.
In the preferred embodiment, the waste liquid concentration device is a multi-tube filter, the multi-tube filter is composed of a waste liquid pump, a filter, a concentrated liquid discharge pipe and a back flushing pump, and aiming at the characteristics of dust waste liquid, the multi-tube filter is adopted for concentrating the waste liquid.
In a preferred embodiment, the filter pressing device is a plate-and-frame filter press, and the separated filter cakes enter a raw material bin for recycling.
In a preferred embodiment, the industrial air purification system disclosed by the invention further comprises a centralized control system, wherein the water film flushing device, the spray flushing device, the electric heating device, the waste liquid concentration device, the filter pressing device and the fan can be automatically started and stopped through the centralized control system according to preset conditions.
Example 1
A specific embodiment of the present invention is given below in conjunction with fig. 1.
As shown in figure 1, the dust-containing air flow (with the concentration of tens of grams to hundreds of grams per cubic meter) generated in the industrial production process firstly enters a 5-shutter dust removing section under the air suction effect of a 1-diagonal flow fan, particles with the particle size of more than 50 microns are intercepted, dust accumulated in the shutter dust removing section enters a 6-waste liquid tank under the effect of a 10-spray flushing device, and water of the 10-spray flushing device is sourced from process water in a factory and is supplemented by an 11-water pump; then the air flow (with the concentration of hundreds of milligrams to several grams per cubic meter) enters a 4-efficient separation tank plate dust removing section, most of particles with the particle size of more than 10 microns are intercepted, and dust intercepted by the high-efficient separation tank plate dust removing section enters a waste liquid tank 6 under the action of a 10-spraying flushing device; at the moment, the air flow (with the concentration of tens of milligrams to hundreds of milligrams per cubic meter) enters the 2 electrostatic dust collection unit, a 3 high-voltage power supply supplies high voltage to a discharge electrode of the 2 electrostatic dust collection unit, the electrostatic field of the 2 electrostatic dust collection unit generates negative ions and electrons, the electrons collide with fine particles, the electrostatic adsorption process is completed under the action of the electric field force, and clean gas is discharged through an outlet. 2 the dust deposited on the anode plate of the electrostatic dust collection unit is washed to a waste liquid tank 6 by a water film washing device 9, and the waste liquid discharged by washing is collected with dust in a dust collection section of a 5-shutter dust collection section and a dust collection section of a 4-efficient separation tank plate. And 7, an electric heating device is arranged in the waste liquid tank 6 to prevent the waste liquid in the waste liquid tank 6 from freezing during winter operation, so that the equipment use is affected.
By utilizing the air purification system, the device outlet has no out-of-standard emission, secondary dust emission is avoided, the gas meets the requirement of flue gas cleaning emission, and the energy consumption is less than that of a single electrostatic precipitator.
Example 2
A preferred embodiment of the present invention is given below in conjunction with fig. 2.
As shown in figure 2, the dust-containing air flow (with the concentration of 10 g-800 g/cubic meter) generated in the metallurgical industry production process firstly enters a 5-shutter dust removal section under the air suction effect of a 1-diagonal flow fan to intercept particles with the particle size of more than 50 microns, dust enters a 6-waste liquid tank under the effect of a 10-spray flushing device, and water of the 10-spray flushing device is sourced from clear liquid of 12-pipe filters, clear liquid of a 14-filter press and plant process water and is supplemented by 11 water pumps; then the air flow (with the concentration of 100 mg-10 g/cubic meter) enters a 4-efficient separation tank plate dust removing section, most of particles with the particle size of more than 10 microns are intercepted, and the intercepted dust enters a 6-waste liquid tank under the action of a 10-spraying flushing device; at the moment, the air flow (with the concentration of 10 mg-200 mg/cubic meter) enters the electrostatic dust collection unit 2, a high voltage is provided for a discharge electrode of the electrostatic dust collection unit 2 by a 3-high-voltage power supply, the discharge electrode is caused to ionize surrounding air, negative ions and electrons are generated, the electrons collide with fine particles, the electrostatic adsorption process is completed under the action of an electric field force, and clean air is discharged into the atmosphere. And 9, the water film flushing device flushes the anode plate particles of the electrostatic dust removal unit 2 to the waste liquid tank 6, and the waste liquid tank is converged with dust of the 5-shutter dust removal section and the 4-efficient separation tank plate dust removal section. Waste liquid in the waste liquid tank 6 enters a 12-pipe filter under the action of a 8-pipe waste liquid pump, the waste liquid in the 12-pipe filter is concentrated and then is conveyed into a 14-filter press through a 13-slurry pump, ash cakes enter a raw material warehouse for recycling, and clear liquid is pumped back to a 9-water film flushing device for anode flushing. And 7, an electric heating device is arranged in the waste liquid tank 6 to prevent waste liquid in the waste liquid tank 6 from freezing during winter operation, so that the concentration of the waste water and the collection of solids are affected.
By utilizing the air purification system, the working environment is effectively improved, the particle resources are replaced and recycled, and the cost is saved by at least 5-10 ten thousand yuan/year.
Claims (12)
1. The industrial air purification system is characterized by comprising a multi-effect dust removal device and a flushing device, wherein the multi-effect dust removal device comprises a shutter dust removal section, a high-efficiency separation groove plate dust removal section and an electrostatic dust removal unit, and a waste liquid collection structure for collecting waste liquid is arranged at the bottom of the multi-effect dust removal device; the multi-effect dust removing device further comprises a fan, the fan is arranged at a gas inlet or a gas outlet of the multi-effect dust removing device, and dust-containing gas sequentially passes through a shutter dust removing section, a high-efficiency separation groove plate dust removing section and an electrostatic dust removing unit for dust removal; the flushing device comprises a spraying flushing device and a water film flushing device, the spraying flushing device flushes particles adhered to the shutter dust removing section and the high-efficiency separation tank plate dust removing section to a waste liquid collecting structure at the bottom of the high-efficiency dust removing device in a spraying mode, the water film flushing device adopts a mode of continuously soaking the anode plate of the electrostatic dust removing unit by liquid drops, and a uniform flushing water film is formed to flush the particles captured to the anode plate into the waste liquid collecting structure;
the shutter dust removing section, the high-efficiency separation groove plate dust removing section and the electrostatic dust removing unit are arranged from bottom to top in the multi-effect dust removing device, and gas flows from bottom to top in the multi-effect dust removing device; the shutter dust removing section intercepts particles with the particle size of more than 50 microns at an inlet of equipment to realize primary dust removal, dust-containing airflow after passing through the shutter dust removing section flows through the high-efficiency separation groove plate dust removing section, and the particles with the particle size of more than 10 microns are intercepted before an electrostatic field of the electrostatic dust removing unit to realize secondary dust removal; the residual fine particles enter an electrostatic field of the electrostatic dust removal unit, and under the action of a high-voltage power supply, the fine particles move to the surface of an anode to be efficiently captured under the action of an electric field force after being charged, so that three-stage dust removal is realized, and the treated air flow meets the clean discharge requirement to be discharged;
the high-efficiency separation groove plate dust removing section is formed by staggered arrangement of a plurality of rows of channel steel with the same specification, the channel steel is uniform in opening direction, the openings are downward, the channel steel with the same row are equidistantly arranged, the distance between two adjacent channel steel with the same row is smaller than or equal to the waist height of the channel steel, and the distance between the upper layer of channel steel and the lower layer of channel steel is smaller than or equal to the leg width of the channel steel; the pressure loss of the high-efficiency separation groove plate dedusting section is 100-300 Pa, the wind speed of dust gas is reduced, the residence time of dust in an electrostatic field is relatively prolonged after the follow-up electrostatic field dedusting, and the electrostatic dedusting efficiency is improved;
the waste liquid in the waste liquid collecting structure is concentrated through the waste liquid concentrating device, then is treated through the filter pressing device, the filter cake is recycled, and the clear liquid generated by the waste liquid concentrating device and the filter pressing device is returned to the flushing device through the clear liquid circulating pipeline for recycling.
2. An industrial air purification system as claimed in claim 1, wherein,
the spray flushing device consists of a water pump, a valve, a spray pipe and nozzles, wherein the spray pipe comprises a main pipe and a plurality of branch pipes, and the nozzles are arranged on the branch pipes.
3. An industrial air purification system as claimed in claim 1, wherein,
the water film flushing device comprises a water film flushing main pipe and an anode water distribution pipe, wherein the water film flushing main pipe is communicated with a plurality of anode water distribution pipes, water outlets are formed in the bottoms of the anode water distribution pipes, water discharged from the water outlets infiltrates an anode plate of the electrostatic dust collection unit, and particles captured to the anode plate are flushed by forming uniform flushing water films.
4. The industrial air purification system of claim 1, wherein the waste collection structure is a waste tank.
5. The industrial air purification system of claim 4, wherein the waste collection structure is further provided with an electrical heating device.
6. The industrial air purification system of claim 1, wherein the fan is a diagonal flow fan.
7. The industrial air purification system of claim 6, wherein the diagonal flow fan is disposed at a gas outlet location of the multi-effect dust collector.
8. The industrial air purification system of claim 1, wherein the waste concentration device is a multi-tube filter.
9. The industrial air purification system of claim 1, wherein the filter press device is a plate and frame filter press.
10. The industrial air purification system according to claim 8 or 9, further comprising a centralized control system, wherein the water film flushing device, the spray flushing device, the waste liquid concentrating device, the filter pressing device and the fan are all automatically started and stopped through the centralized control system according to preset conditions.
11. A process for controlling the emission of smoke in an unstructured manner, which adopts the industrial air purification system as claimed in any one of claims 1 to 10, and comprises the following specific steps:
the smoke dust discharged in an unorganized way enters an inlet of the multi-effect dust removing device along with the environmental air flow under the suction or blowing action of the fan;
intercepting particles with the particle size of more than 50 microns at an inlet of equipment in a shutter dust removing section to realize primary dust removal;
the dust-containing air flow after passing through the shutter dust removing section flows through the high-efficiency separation groove plate dust removing section, and particles with the particle size of more than 10 microns are intercepted before an electrostatic field of the electrostatic dust removing unit for secondary dust removal;
the residual fine particles enter an electrostatic field of the electrostatic dust removal unit, and under the action of a high-voltage power supply, the fine particles move to the surface of an anode to be efficiently captured under the action of an electric field force after being charged, so that three-stage dust removal is realized, and the treated air flow meets the clean discharge requirement to be discharged;
dust particles captured by the shutter dust removing section and the high-efficiency separation groove plate dust removing section are washed into a waste liquid collecting structure by washing water sprayed by a spraying washing device; dust particles on the anode of the electrostatic dust removal unit are washed into the waste liquid collecting structure by the water film washing device, so that waste liquid collection is realized.
12. The process for the control of the emission of soot without organization according to claim 11, wherein,
the process further comprises the following steps: the waste liquid collected in the waste liquid collecting structure is primarily concentrated through the waste liquid concentrating device, the concentration of the concentrated liquid is 10-20%, clear liquid after concentration treatment is connected to the inlet of the water film flushing device for recycling, the concentrated liquid enters the filter pressing device, the separated filter cakes enter the raw material bin for recycling, and clear liquid separated by the filter pressing device is connected to the inlet of the water film flushing device for recycling.
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